SN54LS641

OCTAL BUS TRANSCEIVERS These octal bus transceivers are designed for asynchronous two-way communication between data buses. Control function implementation minimizes external timing requirements. These circuits allow data transmission from the A bus to B or from the B bus to A bus depending upon the logic level of the direction control (DIR) input. Enable input (G) can disable the device so that the buses are effectively isolated. DEVICE LS640 LS641 LS642 LS645 OUTPUT 3-State Open-Collector Open-Collector 3-State LOGIC Inverting True Inverting True SN54/74LS640 SN54/74LS641 SN54/74LS642 SN54/74LS645 OCTAL BUS TRANSCEIVERS LOW POWER SCHOTTKY FUNCTION TABLE CONTROL INPUTS G L L H DIR L H X LS640 LS642 B data to A bus A data to B bus Isolation OPERATION LS641 LS645 B data to A bus A data to B bus Isolation 20 1 J SUFFIX CERAMIC CASE 732-03 20 1 N SUFFIX PLASTIC CASE 738-03 H = HIGH Level, L = LOW Level, X = Irrelevant 20 1 DW SUFFIX SOIC CASE 751D-03 ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC CONNECTION DIAGRAMS DIP (TOP VIEW) ENABLE VCC G B1 20 19 18 B2 17 B3 16 B4 15 B5 14 B6 13 B7 12 B8 11 ENABLE VCC G B1 20 19 18 B2 17 B3 16 B4 15 B5 14 B6 13 B7 12 B8 11 1 DIR 2 A1 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 A8 10 GND 1 DIR 2 A1 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 A8 10 GND SN54 / 74LS640 SN54 / 74LS642 SN54 / 74LS641 SN54 / 74LS645 FAST AND LS TTL DATA 5-1 SN54/74LS640 SN54/74LS645 GUARANTEED OPERATING RANGES Symbol VCC T...